cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A171570 Triangular numbers T such that T+2 is a prime.

Table of values

n a(n)
1 1
2 3
3 15
4 21
5 45
6 105
7 171
8 231
9 351
10 465
11 561
12 741
13 861
14 1275
15 1431
16 1485
17 2211
18 2415
19 2775
20 3081
21 3321
22 4005
23 4371
24 5151
25 7875
26 8385
27 10731
28 11175
29 11781
30 13041
31 13695
32 14535
33 15051
34 15225
35 17205
36 17391
37 17955
38 18915
39 21321
40 22155
41 23871
42 24531

List of values

[1, 3, 15, 21, 45, 105, 171, 231, 351, 465, 561, 741, 861, 1275, 1431, 1485, 2211, 2415, 2775, 3081, 3321, 4005, 4371, 5151, 7875, 8385, 10731, 11175, 11781, 13041, 13695, 14535, 15051, 15225, 17205, 17391, 17955, 18915, 21321, 22155, 23871, 24531]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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